Conversation-meter for telephone systems.



V G; W. LORIMER. i GONVBRSATION vIMIETFR POR TELEPHONE SYSTEMS.

APPLICATION FILED APR.13, 1906.

Patnted Apr. 11, 1911.

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CONVERSATION METER FOR TELEPHONE SYSTEMS.

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y G. W. LORIMER. .ooNvERsATIoN METER PoR TELEPHONE SYSTEMS. lAPPLICATION FILED APR. 13, 1906'.l 989,529 Patented Apr. 11, 1911.

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APPLICATION FILED 'APR. 13, 1906.

Patented Apr.` 11, 1911.

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STAFgS* TENT FIC.

GEORGE W. Lonrivrnn, or Promi, OHIO.

CONVERSATION-METER FOR TELEPHONE SYSTEMS.

To all 'whom it may concern;

Be it known that I, GEORGE W. LORIMER, a citizen of the United States ofAmerica, and a resident of Piqua, county of Miami, and State of Ohio,have invented a new and useful Improvement in Conversation.- Meters forTelephone Systems, of which the follow ing is a specification.

` y invention relates to conversation counters for telephonesubstations, and has for its object, in a message rate or meas- 'uredservice method of charging for telephone service, to provide meanswhereby the subscriber-'may be permitted to record at his station, oneby one, the conversations which he holds from it; to compel suchrecording to be done-as a means of securing the service, and to permltthis recording only at such times as the securing of the servicerecorded is made certain.

My invention is specifically set -forth herein as applied to amechanical device for transmitting signals in an automatic tele# phonesystem, the signa-l transmitter herein shown and described being coveredby my United States application No. 311,139, filed April 11, 1906,claims for the signal transmitter being carried by that application.

My invention is illustrated in the accompanying drawings, in whichsimilar characters refer to similar parts throughout the several views,and in which- Figure 1 is a rear view of the meter and the associatedtelephone mechanism; Fig. 2

is a side view of the same; Fig. 3 is a conventional view of the circuitas adaptedto one system of transmitting and receiving speech. Fig. 4 isa conventional view of the circuit as adapted to. another ,system oftransmitting and-receiving speech. Fig. 5 is a back View of the signaltransmitting mechanism in greater detail than is shown in Fig. 1. Fig. 6is a section of signal transmitting mechanism cn the line 6 of Fig. 7.Fig. 7 is a sectional View ofthe signal transmitting mechanism on theline 7 of Fig. 5. Fig. 8 shows circuits of the signal ltransmittingmechanism. Fig. 9 shows central oilice,y circuits associated with thesubstation circuits of Fig. 8 and co `5peratingV therewith.

I shall describe lirst the signal transmitting device, in connectionwith which my conversation meter is hereindescribed.

- 'Specification of Letters Pate-nt.

Application filed Apri1 13, 1906.

Patent-.eu Apr. i1, i911. Serial No. 311,468.

detail of the signal transmitting device: This signal .transmitter isdesigned for installation at a telephone substation operat.

equipment to connect its substation with any line desired. Inope-ration, the digit arms 41, 42, 43, 44, representing thousands,hundreds, tens and units respectively, are placedv upon those digitlpoints corresponding to the four digits respectively of the directorynumber of the telephone line with desired to connect. In Fig. 8 thedevice is shown set ready to call line No. 0286. The digit points `uponwhich the digit arms rest are connected to.f;ontact points 49, 49, etc.,and a brushO, mounted upon an arm adapted to sweep around the circle ofcontact points and make electrical connection with each point in order.Points shown black are isolated. Brush 52 carried by `arm 51 makescontact with collector ring 53 and thus any contact point' connectedwith by brush 50 is -connected to conductor 54. Brush 50 and arm 51 arecarried by shaft 55 which (see Figs. 6 and 7.),'through pinion 56,gear57, pawl 58, sleeved ratchet 59, is driven, by mainspring, the movementof the gear train, and therefore of brush 50, being controlled by anescapement comprising worm wheel 61, worm 62, toothed wheel 63 andtinger 64, the finger64 being rigidly mounted with armature 65 which isoperated by electromagnet 66, which is controlled from the centraloiiicein a manner to be described later herein.

In operating the signal transmitter, the

mainspring 3 is wound by giving the disk 2 a quarter turn counterclockwise, as viewed in F 5. This is done through link 67 by turning thedisk 4. Knob 68 with transverse `handle 68 is rigidly atxed to shaft 69.

which shaft bears also the disk 1, and which shaft is normally'held inits posit-ion of rest by t-he spring 70. By turning shaft 69 counterclockwise a quart-er revolution, as viewed in'Fig. 5; the disk 1 engagesthe pin -5 which is fixed in disk 4, and thus propels disk 4 a quarterrevolution, which pushes lthrough link 67 and thus propels disk 2 aquarterrevolution, which winds up main- V'iteferring to Figs. 5, 6, 7,8vwhich show,-

spring 3the outer end of that spring bewhich it is j the gear' traincontrolled by the escapement 61, 62, 63, 64. The knob 68 may returnimmediately, however1 sineethe disk -1 may yleave pin 5, but uponreturnoi:l -that knob and its attached disk 1 to normal, the latch 6-will drop into engagement with disk 1 and prevent a subsequent operationof the knob until after the complete return of disk 4'. This is effectedby pin 7 in disk 4 and spring 8 on latbh 6. Latch 6 is held out ofengagement with disk 1 by the-lifting of pin 7 on spring 8, which springis'fixed in latch '6. When disk 4 returns to normal fully, latch 6 isagain lifted out of engage ment with disk 1 and the knob 68 may beoperated again.

I have described how mainspring 3 is wound by a quarter turn by thepatron in inaugurating a telephone call. The disk 2 in rotating haslifted latch 11 from its notch 71, the movement of the latch havinglifted the pin 10 fixed in thelatch 11 out of the notch 12 of the disk13. The disk 13, worm wheel 61 and the pinion 56 are all integral withthevshaft 55, and when thus placed under tension of spring 3, themovement of all parts is controlled by the finger 64. The first twosteps of this gear train are secured by mechanical Acontrol of thefinger 64, the subsequent steps are electromagnetically controlled.-Upon the turning of the shaft 69 to inaugurate the call, the disk 72.iixed to that shaft was revolved and lifted the 'crank arm 73 whichpressed against the armature 65, swinging it upon its pivot 74 andmoving the finger 64 to the left, as viewed in Fig. 5, permitting thefirst step of the gear train to take place on the first application ofthe power of the spring 3 through the pawl 58 and associated parts. Thispreliminary step does not move the brush 50 from thev conducting pin 45,as it will be noted that the brush 50 projects beyond the conducting pin45 a suiiicient distance to permit the arm 51 to move one step beforecausing the brush 50 toA clear that pin. Since the armature 65 is thusheld locked bythe crank arm 73, so long as the knob 68 is out of itsnormal position, the knob 68 must perforce be returned to its normalositionto further the progress. of the call inaugurated. Upon return ofknob 68'and disk 72, crank arm 73 drops into the notch in disk 72 andreleases finger 64 which under tension of its spring returns to itsright hand position as viewed in Fig. 5, and ermits the second step ofthe arm 51 which) passes brush 50 into'contact with conducting pin 46.

y It will be observed that in the institution of the call, the patronoperating the automatic substation signal transmitter first sets hisdigit arms to the directory number desired, and then is compelled toturn lthe knob 68 throughout an entire quarter revolution to cause thepawl 58 to engage the next tooth of ratchet 49, and then is compelled torestore knob 68, or to permit the restoration of that knob to normal byspring 70 in order that diskv72 may permit crank arm 73 to releasearmature 65 to control the escapement of the gear train placed undertension, and thus of the arm51 and brush 50, one revolu` tion of thatarm and brush being required to effect connection with a desired line.Interference stud 75 upon hook lever 9 lies Within a notch in disk 2when the hook lever 9 is up; consequently the hook 9 must be down ininstituting a call, and, furthermore, it is positively locked down untildisk 2 has completed such portion of its return as will permit the notchtherein to register again with interference stud 75. Knob 68 novi islocked by latch 6 on diskA 1, andv the device is ing through :theescapement. A

The two preliminary steps ofthe brush,50 have placed it in contact withconducting stud 46 whence an electric circuit is closed as follows: 76,77 7.8, 46, 50, 51, 52, 53,54, 87, 88, L1 and over line conductor L1 tothe central office equipment, this beingithe signal to the centraloffice that a call has been instituted. The signal is not sent untilafter the arm 51 and brush 5() have been placed wholly under control ofmagnet 66, which magnet is controlled by current impulses from thecentral office over line conductor L2 and thence over elements 79, 80,81, 66,17, 18 and ground, the contacts 17,-18 being closed by thelelevated position of latch 11. The brush 50 in, moving around itscircleof contacts makes electrical connection with eachv in turn and offers apath from L1 to ground whenever it encounters a conducting contact studwhichl is associated with a digit point which at that time is connectedwith by digi't"'arm 41, 42, 43 or 44. The central o'Hice apparatus is sodesigned as to coperate with the substation transmitter asl follows:Current impulses are sent over line L2 to ground, successivelyenergizing and deenergizingv electromagnet 66, thus permitting vwhollyunder control of, the magnet 66 act- 'brush 50 -to step around andsuccessively connect with the points in its circle in proper synchronismwith selective stepping devices in the central office, ,thel selectivestepping devices being further controlled by ground circuits encounteredupon L1. Thus when in the condition shown in Fig. 8, the

esegsae arm 51 revolves in response to control of electromagnet 66. thebrushv 50 comes into electrical connection with the conducting point 49when the central office stepping apparatus is in aposition correspondingto thousands, since digit arm 41 is set upon 0 thousands. In similarmanner the positions of the digit arms 42, 43, 44 are signaled to thecentral office through the occurrence ofgrounds upon L1 in the travel ofthe brush 50 as controlled by impulses from the central otiice over L2..

, Referring now to Fig. 9: The complete lapparatus of the central otticeis not herein ydescribed as it is already publicly known or circles ofcontacts being substantial] y threel double rows. Movable brushes 93,94, 95, 96, 97, 98 are pivotally mounted axially within the cylinder andare adapted to move over the rows of contacts. Brushes 93-94 areconnected together and form substantially a double bridging brush forthe upper double row of contacts.` 'The same is true of pairs of brushes95-96 and 97k98.

The construction here described iswell .known in the art and isspecifically set forth in the British patent cited. The brushes are.

mounted upon shaft 99 which' carries the clutch disk 100 and the clutchdog 101, the dog being controlled by the electromagnet 102; the brushesmove continuously over the contacts when the dog is withdrawn from theclutch disk.

An auxiliary rotary ,switching device is shown controlled by theelectromagnet 103. In this device is a double arc of waiting contacts.1ML-105, etc., a pair of movable brushes 1064107 carried by the shaft108 concentric with the waiting contacts, and the electromagnet 103having an armature adapted to control the movement of the brushes overthe contacts step by step. Such other of the elements of Fig.v 9 as areinvolved in the operation of the signal transmitter will be understoodby the following description of the operation of the device.

The position of the brush 50 in Fig. Sis that occupied by that brushwhen the signal transmitter' is not in use. lt has been described thatupon institution of a call, the brush 50 is set forward mechanicallytwosteps; that the first step is not sutlicient to cause the brush 50 topass the pin 45, and that the second lstep of the brush 50 causes it toleave the pin and to pass into contact with the adjacent pin which isconnected tov earth at the substation through conductor 76. In thisposition the circuit may be traced from positive side of battery throughthe relay helix 119 to L1 and thence through 88, 87, 54, 53, 52, 51, 50,46, 78, 77, 76 to earth. As the device of Fig. 9 begins to revolve, thebridged brushes 93-94 connect the positive terminal of battery throughcontacts 91-92 to L2, thus completing a circuit over L2, 79, 80, 81,66,17, 18, etc., to earth, energizing 66 and causing brush to take onestep which breaks theleircuit through helix 119 just described andplaces the brush 50 in contact with the pin '47 which is an insulatedone. As the brushes 93-94 pass farther, the circuit through them isinterrupted at 94-92, and by the consequent denergization of 66 thebrush 50 is advanced another step and now rests in contact with pin 48,which also is an insulated one. Next, the brushes 95-96 make connectionwith contacts 109-110 and a circuit is completed from the positive sideof `battery through 111, 112, 109, 95, 96, 110,

113, 114, 103, and to earth, energizing 103 and causing the brushes106-107 to step v.forward one step into connection with contacts 104-105respectively, which are the contacts corresponding to the 0 thousandgroup of subscribers lines. Next, brushes 93-94 connect contacts 115-116and brushes 97-98 simultaneously' connect contacts 117.-118; the formerpair of brushes close a circuit from positive terminal of battery to L2and thence through 79, 80, 81, 66, 17, 18, to earth, causing bi .ish 50to make a step and to pass into contact with the pin 49, which isconnected to earth at the sub.- station; by this movement of the brush50, a circuit is closed from the positive terminal of battery throughthe relay helix 119 to L1, 88, 87, 54, 53, 52, 51, 50, 49, thence to thefirst or No. 0 point of the thousands digit indicator, and inasmuch asthe thousands digit arm in Fig.' 8 is set upon that point, the circuitAis completed to earth at the substation through 77-76, thus energizingthe relay helix 119 and attracting the armature 111; by the attractionof the armature 111 the circuit, is closed from positive pole. ofbattery through 111, 121, 118, 98, 97. '117. 122, 123, relay helix 120to negative pole i of battery, `which circuit is a locking circuit .tomaintain the relay armature 111 independently of the continuance of thesubstation contact of brush 50. By this locking of the armature 111, theconductor 112 is isolated from the battery terlninal and further closngof the circuit above described as energizing magnet 103 is impossible;In the continuance of the motion of fthe brushes, the brushes v93-94repeatedly energize and denergize magnet 66 and thus step theV brush 5()over the first quadrant of the signal transmitter, while brushes 97-98hold closed thelocking circuit of the relay-wind,-

ing 120. As the brushes leave the twentyfirst cout-act ofv theirrespective rows, the.

locking circuit of the relay helix l120` is broken; the brush 50 atthistimehas passed' beyond the first quadrant of the signal transmitterand is entering the second' quadrant. As before, the brushes 93-94-sendcurrent impulses overthe line L2 to propel the brush 50, the brushes9596 send current inpulses through 111-112 and thence through vwire 124and 125 to some further device for intracted by energization of helix119 and will be retained by energization of helix 120, therebypreventing further impulses, and thus determining the con-trol ofthedistant brushes acting to select in response to control by the hundredsdigit arm of the signal transmitter in amanner analogous to brushesl06-107 in response to control of the thousands digit arm of the signaltransmitter. The third and fourth quadrantsof the signal transmitter arecontrolled by a further device similar to that of Fig. 9,\ and thedigital signals from the brush are similarly interpreted.

' lfVhen the brush 50 has made approxi-l mately its complete circle, thedisk 2 will have returned nearly to normal and the hook lever 9 will bepermitted to rise, giv? ing proper conditions for conversation.l

To review the mechanical conditions for instituting a call by means of'the signal transmitter herein illustrated; (referring close of theinitial movements, thedisk 1 isl to Fig. 1), the hook 9 must be downland the disk 1 must be turned and restored; at'the in the position shownin Fig. 1, the latch .6

revolved counter clockwise a quarter turn;

at'the close of the transmission of the signal and when, sofar as thesignal transmitter isA concerned, the telephone connection is completeand in readiness for conversation, the disk 1 will be locked by thelatch 6, the disk 2 will have returned so nearly to its normal positionas to permit the rising of the hook 9, and the latch 11 will remainelevatedby reason of the-engagement of its pin 10 with the edge of thedisk 13.

'To the signal transmitter device thus de-- scribed, yI add the meter 39with its controlling devices as follows: Push slide 22 has,

projecting push button 21 accessible to the two'notches adapted to beengagedby dogs 24 and 30. The slide 22 is carried inthe sleeve 27 andtends to hold its button 2h out- Ward by tension of a spiral spring..The arm of the meter 39 -is pressed downwardy by aspiral spring and maybe pushed upward y; bythe slide rod 29. The. slide rod 29 has kanoutwardly turned end portion to interfere with the pin 3-7 upon thelatch 6 whereby .the

latch 6 is prevented from lifting from the the slide rod 29 will lockthe latch 6 against release of disk 1, will open the springs 14,

V15, 16 from each other, and will operate the arm of the meter 39. Thelifting of-the rod 29 is accomplished by a crank arm upon the rockingshaft which carries" the crank arm' 28, the crank arm 28 beingconnectedby pin and slotconnection with the push slide 22; the slide rod 29 maybe operated therefore by pushing the button 21, resulting in registeringthe call, locking the disk 1 and opening the springs 14, 15, 16.

A call having been instituted and connection having been secured withlthe desired line, the ,called subscriber answering will send `voicecurrents to the calling station. By reference to Figs. 3 and'4 it willbe seen that if springs 14,15 and 16 were all in contact 'as would betrue except for upward pressure of the stud 19 against-the spring14,.the transmitter T will be Ashort-circuited and the receiver Rl willbe shunted by-the resistance 20. The magnitude of the resistance 20 issuch as ,to enable received speech to be heard in the receiver R,=whileyet not great lenough to enable that receiver effectively to `be used asa magneto telephone transmitter. 4The condition ofithe substation setimmediatelyupon calling, therefore, is that the Zcallinglsubscriber mayhear the response of gthe'called subscriber and will be unable toengages the,disk 1 and the disk 2 has' been;`

orjreceiver, because of the closed condition "of 1125;?by-'path'y abouteach. Because of inspeaktoghim either through his transmitter structionsto that effect, the vcalling subscribernow. will press the button 21.This 'will force the slide 22 in its guides, with two results. First,that the tooth 23 of the slide j22 will be engaged by the pin 24dropping into it, thus lowering the shaft 25, which is vconnected withthe pin 24 by means ,of the frame 26;A Removal of pressure fromthe"button 21 will leave'it lockedag'ainst return because of the engagementof 23 and 24, though' the spring 27 tends against that 'engagement tothrow the button outward.- The second-result of this inward pressure kofthe llltton 21 'is to rock the angle arm 28, lifting t shaft 29 l andoperating the meter 39.

move thezspring 14,. The `counting of the.

meter, therefore, accompanied bythe locking of the slide 22, breaks andholds broken the contacts 111, 15, and 16, so releasing the transmitterfrom its short-circuit `and the receiver Vfrom its shunt. Conversationmay now proceed, and upon its completion the restoration of the receiver-to the switch hook 9 will cause the latter to press upward the rod 25to remove the engagement of 23 outward into its normal position. Theconversation thus will have been charged upon the meter, and more thanone count 'will have been prevented because of the inability of thesubscriber to press the button more than once, even if he shouldattempt-to do so, by

`malicious intent or -thouglitlessness As the system is automaticandzthe connection has 'been broken at the central oilice as a responseto the depression of the switch hook 9, a new call now may beinstituted, with a repetition of the meter counting if the calledsubscriber responds and with no counting if he dpes not.

Should a malicious or careless person attempt to press 'the button 21without instituting a call, and` thus to charge for a service notsecured, his success will be prevented b v the engagement` of the catch30 in another notch than 23 in the slide22; This notch faces in theopposite-direction from 23 and vis adapted to prevent an inward pressureunless the rod ,31, carrying the catchi30,- is

elevated.- This; will be true only when the disk 2 is nearly inl itsnormal position4 Such a position of that'fdisk is shown inFig. 1,

--and lin solrestingvthe lug 32 engages thel Vlower end ofthe" shaft 31so holding the catch 30 outfof the slide 22 wheneverv the pawl 11standsin the position shown iii-Fig.

1, which is the position permitted byithe4 gear train of the telephoneset during a time of conversation resulting froiila call lby a patron atthis station. Buta conversation resulting lfrom a call to this stationwill take place with the pawl 11 within its notch in the disk 2 and alsowith its pinflO engaging the notch 12 in the disk 13.l There is thus 'amechanical difference' in the telephone set, between the conversationsof a ,sent and a received call. The inclined plane 'p33 borne bythe'pawl ll is adapted to slide behindthe rod 31when thepawl falls intothe vnotches as described. In so doing the rod 31V has itslower partswung toward the observer viewing Fig. '1, permitting it to disk l towhich the handle ofthe ,catch 30 in the slide 22, preventing anyregistry upon the meter by pressure on the button 21 when the pawl l1 isin its normal position. It will be noted that the spring 34C bearsaga-inst the rodl, holding it normally in position to be engaged by thelug 32. Thebracket 35 is so mortised as to permitthe shaft 31to be'moved to clear the lu 32 when vthat shall be necessary.

The previously described operations will make clearthatvthe slide 22 isonly freed by thev catch `30 when a call has been instituted, which timeonly is a proper one for a possible registry upon the meter.

Should a patron attempt to secure successive connections without morethan one pressure upon the button 21 by holding this ltute such callsbecause of the engagement of the right angled end of the rod" 29 withthe pin 37. The main spring 3 could 'not bc wound nor a call transmittedduring -sucli a holding of the/pin 37, as in that position the pawl 6willengage the shoulder of the device is directly attached.

Having thus. described my invention, what I claim as newgaiidmV desireto secure by Letters Patent is: l l

l.4 In a measured service telephone, a con'- versation "meter, manualactuating means therefor, andcall-sending means adapted.V

to be locked against operation during actual tion of such manual means.

2. In a measured service telephone, a conversation meter, manual.operating means therefor, call-sending means adapted to be locked duringactuation of'said meter, and

-meansadapted to lock said meter against goperation during conversation.

i 3. In a measured service telephone, atalkf 'ing circuit, aconversation meter, a call-send- .ing device, a meter-operating devicelocked against operation when said talking circuit `i'sin condition forconversation, and means locking said call-sending device when saidmeter-operating device is actuated. 4. In a substation telephone, aconversation meter, an actuating device therefor, a call-sending device,a talking circuit, and means locking both said meter-actuating and saidcall-sending devices when said talking circuit is in use.

5. In a measured service telephone, a call-` sending device, atransmitter, a conversation meter and actuating means therefor, a shunt'about said transmitter adapted to be closed during operation of saidcall-sending device and to be opened during operation of saidmeter-actuating means, aii.d, \i'neans locking said meter-actuatingmeaflsidlrng couver;lisoI sation.

, device; a transmitter; a shunt for said trans- C transmitter;disabling means,

electrical switch prior to the operation of` 6. In a telephone set, areceiver, a transmitter, and a by-path for each; a conversation meterand actuating means therefor, a

call-sending device and means adapting both l said by-pathsautomatically to be opened. during conversation upon a received call,.and manually opened during' conversation upon a sent call. j

4 In a telephone set, a receiver, a transmitter, and a by-Npath foreach; a conversation meter and actuating means therefor, a 'call-sendingdevice and means adapted to close said ley-paths -on sendinga call, andto break said pathson recording a conversation. i

8. .In a substation telephone, a conversaf tion meter, .actuating meanstherefor, an 'electrical switch operated by said actuating a transmittershort-circuited by said said actuating means,'a switch hook, and meansfor locking said actuating means upon operation of said actuating meanswhen said switch hook is elevated, and releasing said, actuating meanswhen said switch hook is depressed.

9. In a substantion telephone, a switchhook, a conversation meter and apress-button therefor, a rotary circuit-changing automatic call-sendingdevice and means locking said press-button except after operation ofsaid call-sending device and while said switch-hook is elevated. 10. Ina substantion telephone, a conversation meter, a press-button therefor,a callsending device and means locking said callsending device when saidpress-button is actuated. f

11. In a substation telephone, automatic impulse-governing means forsending a call,

for said call recording means, and means associated with said callsending means for unlocking said call recording means.

.V 12. In a substation telephone, a calling mitter and having an opencontact controlled bysaid calling device, said contact .being adapted toclose said shunt when said calling device is olf normal and to open saidshunt when said calling device is in its normal position of disuse.

13. In a substation telephone, a speechtransmitter; a call-sendingdevice; a shunt 5 for said speechtransmitter and controlled by saidcall-sendingI device, said call-sending device operating to close lsaidshunt when said call-sending device is off normal and to hold said shuntopen vwhen said call-sending device is in its normal position of disuse;and further means v when said crll-senlding device 1s positioned toclose said shunt.`

14. In a substation telephone, a speech means for said transfmeans forremoving said transmitter; locking latch :tor said means;

for recording a call, lockil'g means' for openingl said shunt ment ofthe telephone hook.

15. Ina substation telephone, transmitter; shunt for said transmitter; apress-button for removing said shunt from said transmitter; a lockinglatch for said press-button; and-means whereby saidlocking latch isoperated to release said pressbutton by the downward movement of thetelephone hook.

16. In a substationl telephone, transmitter; a shunt. for saidtransmitter; shunt from said and further means whereby said lockinglatch isl operated to release said means upon ,the downward movement ofthe telephone hook.

17. In a substation telephone, a speech transmitter; disabling means forsaid transmitter; restoring means for said transmitter; call-sendingmeans operating said disabling means upon the sending of a call; andlocking means for said call-sending means, said restoring meansoperating said locking mea-ns upon the operation of said restoring meansto lock said call-sending means upon the operation of said restoringmeans to restore said transmitter into service.

18. In a substation telephone, a speech transmitter; disabling means forsaid transmitter; restoring means for said transmitter; call-sendingmeans o erating said disabling means upon the sending of' a call;locking means for said call-sending means, said restoring means operatingsaid locking means to lock said call-sendingA means upon the operationof said restoring means to restore said transmitter into service; andfurther locking means for said restoring -means, said further lockingmeans being operated to unlock said restoring means upon the downwardmotion of the telephone switchhook.

19. In a substation telephone, a speech transmitter; a shunt for saidtransmitter; a press-button for removing said shunt from saidtransmitter; a call-sending device operating to shunt said transmitterupon the sending of a call; and a locking latch for said call sendingdevice, said press-button operating said locking latch to lock saidcall-sending device upon theressing of said button to remove said shuntrom said transmitter. l

20. In a substation telephone, a speech transmitter; a shunt for saidtransmitter; a press-button for removing said shunt from saidtransmitter; a call-sending device operating to shunt said transmitterupon the sending ofa call; a locking latch for said call-sendingdevice;said press-button opera 'speech a speechl ating Said locking latch tolock said. call.- Signed by me at Piqua, county of Miami, sending device4upon the pressing of said State of Ohio, in the presence of twoWitbutton to remove said shunt vfrom said transnesses. f I mitter; andalocking latch for said pressa GEORGE'W. LORIMERL 5 button, said 4buttonlatch being operated to Witnesses:

unlock said button upon a downward 1no- I GEORGE A. VAUGIER, tion of theswitc'hhook. ELBERT M. BELL.

Gopes of this patent maybe obtained for ve cents each, by addressing theCommissioner of ratents.

washington, n. c.

